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2 SheetsfSheet 1.

(No Modem P. KRICKL.

SLIDE VALVE. No. 363,750. Patented May 24, 1887. :y I

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P. KRICKL.I SLIDE VALVE.

-2 Sheets-Sheet 2.

Patented May 24, 183?.

UNITED STATES PATENT OFFICE.

PHILIP KRICKL, OF CHICAGO, ILLINOIS, ASSIGNOR TO DENNIS O. B. LADD,

OF SAME PLACE.

SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 363,750, dated May 24,1887. Application filed August 6, 1886. Serial No. 210,171. (No model.)

To all whoml it may concern:

Be it known that I, PHILIP KRIoxL, of Chicago, in the county of Cook andState of Illinois, have invented certain new and useful Improvements inSlidefValves for Engines, 'of which the following is a description,reference being had to the accompanying drawings, in Which- Figure 1 isaplan view. Fig. 2 is a longitudinal sectional View taken upon the linea: fr, Fig. l, viewed in the direction of the arrow there shown. Fig. 3is a transverse sectional view taken upon the line y y, Fig. 1, viewedin the direction of the arrow there shown. Fig. Llis a bottom view indetail of the supplementary valve. Fig. 5 is a side or edge view of saidsupplemental valve; and Fig. 6 is a planview of a modication ofsaidvalve in which the relative movements of the parts are reversed.

Like letters of reference indicate like parts in the different igures.

The object of myinvention is to provide a compound sliding valve forsteam-engines which may be so constructed as to produce an acceleratinginitiatory movement of the supplemental valve, whereby a high initialpressure may be obtained at the beginning of the piston-stroke, while atthe same time a release is provided for compression in the opposite endof the-cylinder, continuing throughout, or nearly throughout, the entirestroke, so that the full effective power of the expansion may beutilized without the usual counteracting forces, all of which ishereinafter more particularly described, and denitely pointed out in theclaims.

In the drawings, A represents the walls or plates of the steam-chest,whileB is the cylinder connected with said steam-chest by means ofsteannways aa', Fig. 2.

C represents the usual exhaust-port.

D is the main valve connected directly with the valve-rod D', whichpasses through the usual stuffing-box, d, and is attached to lugs d' d',cast or otherwise formed upon the respective sides of the valve D.Collars d2 d2 are attached to said valve-rod, so as to bear against saidlugs, and are rigidly secured in place by means of set-screws,or in anywell-known manner.

E E' are admission-ports in the main valve, through which steam isintended to be admitted in addition to that which is ordinarily admittedat the end of the valve, the intention being to admit the steam throughboth places at thesame time, so that twice the volume may be admittedduring a given movement of the valve. I am enabled to accomplish thisresult by meansof a supplemental valve, F, which consists of a platehaving a raised oblong part, F', and depending iianges f, the wholebeing box-shaped and open at the bottom, as shown. ,y TheV supplementalvalve F rests flatly and loosely uponthe main valve D, t-he latterhaving an oblong` opening, D2, formed therein for the reception of thelower portion or iianges, f, ofthe box-part F', which flanges extend'toand rest upon the main valve-seat. Said openingis of about sufficientwidth to extend from the outer edge of one of the steamways to theopposite outer edge of the exhaustport C, or from the point cti to c,Fig. 2, thus permitting a longitudinal play therein of the dependingportion of the box F', which is given a different and independentmovement from that of the main valve D, as hereinafter shown.

Pivotally attached to a wrist-pin, g, secured to the' valve-rod, is alever, G, one end of which is attached to a link, H, pivotally attached,preferably at h, to a ledge, A', Fig. 3, upon the interior of thesteam-chest. Said link H is made in two parts having right and left handscrew-threads h', upon which is screwed a union-nut, H', by means ofwhich said link may be lengthened or shortened at will. Preferably uponthe opposite end of the lever G, I provide a wrist'pin, g', Fig. l, towhich is loosely attached a link, J, the opposite end of which isloosely attached to a wristpin, f', projecting upwardly from the part F'of the valve F. The valve D is directly reciprocated by the valve-rodD', while the supplemental valve F is actuated by the link J, which isin turn moved by the lever G. ment of the supplemental valve is as muchfaster than that of the main valve as the velocity of the free end ofthe lever is in excess of that of the valve-rod. This movement perrIhusit is obvious that the initial move-4 IOO mits a considerable opening oftheadmissionports E simultaneously with that at the end of the valve, asindicated by the darts at the right in Figs. l and 2, so that a largevolume of steam is admitted behind the piston B, Fig. 2, at thebeginning of the stroke, thus utilizing the full'force of the steam atthe moment when it is most needed. On the other hand, the movement oftheopposite side of the valve is such as to afford ample opportunity forthe full and free escape of the compressed steam throughout the stroke.

Said device may be modilied and a slower movement given to thesupplemental valve'by attaching the free end of the lever G to Ythevalve-rod and pivoting the link J midway between, as at g2, Fig. 6; butI prefer the construction shown in Fig. 1, in that it gives anaccelerating movement to the supplemental valve, thereby producing ahigh initial pressure. The arrow in the steamway a shows the movement ofthe steam into the exhaust-port C, which, it is obvious, must remainopen a sufficient time to avoid unnecessary compression.

It is obvious that the lever G may be placed upon the outside of thesteam-chest and the link J elongated, so as to form a secondaryvalve-rod connecting with the supplemental valve, whereby the sameresult may be accomplished without varying the essential features of myinvention.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, isp l. A main slide-valve provided with portsat or near its respective ends for the admissionV of steam to thesteamways of the cylinder, in addition to that admitted at the ends ofsaid valve, and a supplemental Valve for opening and closing said ports.

2. A slide-valve provided with ports at or near its respective ends forthe admission of steam to the steamways of the cylinder, in addition tothat at the ends of said valve, combined with a supplemental valve foropening and closing said ports, and means, as a lever pivoted to thevalve-rod and connected with said supplemental valve, for imparting anaccelerating motion to the latter, substantially as and for the purposesset forth.

3. The combination of a main slide-valve having ports at or near itsrespective ends, with a supplemental valve for opening and closing` saidports, having an exhaust-cavity therein provided with flanges whichextend downwardly through an enlarged opening in the main valve Ato thevalve-seat, and means for imparting to said supplemental valve a greaterrelative throw than is given to the main valve, substantially as and forthe purposes specied.

4. rlhe combination of a main slide-valve having ports ator near itsrespective ends, with a supplemental valve for opening and closing saidports, said supplemental valve having an exhaust-cavity therein providedwith depending flanges which rest upon the valve-seat, and said mainvalve having an opening therein for the reception of said anges, ofsufficient size to permit a longitudinal play of said depending portionof the supplemental valve, and means for imparting to the latter agreater throw than is given to the main valve, substantially as and forthe purposes set forth.

5. The combination, with the valve D, having ports E E and opening D2,of the supplemental valve F, provided with part F and depending tlangesf', and means, as the lever G and link-connections H J, for imparting anaccelerating motion thereto, whereby a high initial pressure may beimparted at the beginning of the stroke and unnecessary compressionmaybe released, substantially as and for the purposes specified.

6. In a compound slide-valve, the supplemental valve F, provided withbox-shaped portion F', having an interior cavity open at the bottom anddepending iianges arranged to slide upon the main valve-seat, and meansfor reciprocating said supplemental valve, substantially as and for thepurposes set forth.

PHILIP KRICKL.

XVitnesses:

D. H. FLETCHER, J. B. HALPENNY.

